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Mirrors > Home > MPE Home > Th. List > grpn0 | Structured version Visualization version GIF version |
Description: A group is not empty. (Contributed by Szymon Jaroszewicz, 3-Apr-2007.) (Revised by Mario Carneiro, 2-Dec-2014.) |
Ref | Expression |
---|---|
grpn0 | ⊢ (𝐺 ∈ Grp → 𝐺 ≠ ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2610 | . . 3 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
2 | 1 | grpbn0 17274 | . 2 ⊢ (𝐺 ∈ Grp → (Base‘𝐺) ≠ ∅) |
3 | fveq2 6103 | . . . 4 ⊢ (𝐺 = ∅ → (Base‘𝐺) = (Base‘∅)) | |
4 | base0 15740 | . . . 4 ⊢ ∅ = (Base‘∅) | |
5 | 3, 4 | syl6eqr 2662 | . . 3 ⊢ (𝐺 = ∅ → (Base‘𝐺) = ∅) |
6 | 5 | necon3i 2814 | . 2 ⊢ ((Base‘𝐺) ≠ ∅ → 𝐺 ≠ ∅) |
7 | 2, 6 | syl 17 | 1 ⊢ (𝐺 ∈ Grp → 𝐺 ≠ ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∅c0 3874 ‘cfv 5804 Basecbs 15695 Grpcgrp 17245 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-iota 5768 df-fun 5806 df-fv 5812 df-riota 6511 df-ov 6552 df-slot 15699 df-base 15700 df-0g 15925 df-mgm 17065 df-sgrp 17107 df-mnd 17118 df-grp 17248 |
This theorem is referenced by: lactghmga 17647 |
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